=gradient($from, $to)
	/* fallback/image non-cover color */
	background-color: $from
	/* Firefox 3.6+ */
	background-image: -moz-linear-gradient($from, $to)
	/* Safari 4+, Chrome 1+ */
	background-image: -webkit-gradient(linear, 0% 0%, 0% 100%, from($from), to($to))
	/* Safari 5.1+, Chrome 10+ */
	background-image: -webkit-linear-gradient($from, $to)
	/* Opera 11.10+ */
	background-image: -o-linear-gradient($from, $to)
	
=opacity($value) 
	opacity: #{"." + $value}
	filter: alpha(opacity=$value)
	-ms-filter: "alpha(opacity=$value)"
	-khtml-opacity: #{"." + $value}
	-moz-opacity: #{"." + $value}
	
=rotate($value)
	-webkit-transform: rotate(#{$value+"deg"})
	-moz-transform: rotate(#{$value+"deg"})
	
=box-shadow($hoffset, $voffset, $blur, $color)
	-moz-box-shadow: $hoffset $voffset $blur $color
	-webkit-box-shadow: $hoffset $voffset $blur $color
	box-shadow: $hoffset $voffset $blur $color
	